Complex.kt

@JsonClass(generateAdapter = true)
data class Foo<T>(
    @Json(name = "barString") val bar: String,
    val defaultValue: Int = 0,
    val nullableString: String?,
    val typeParam: T? = null,
    val tList: List<T>
)

// Generated by Moshi Kotlin Code Gen
class FooJsonAdapter<T>(moshi: Moshi, types: Array<Type>) : JsonAdapter<Foo<T>>() {
    private val options: JsonReader.Options =
            JsonReader.Options.of("barString", "defaultValue", "nullableString", "typeParam", "tList")

    private val stringAdapter: JsonAdapter<String> = moshi.adapter(String::class.java).nonNull()

    private val intAdapter: JsonAdapter<Int> = moshi.adapter(Int::class.java).nonNull()

    private val nullableStringAdapter: JsonAdapter<String?> =
            moshi.adapter(String::class.java).nullSafe()

    private val nullableTAdapter: JsonAdapter<T?> = moshi.adapter<T?>(types[0]).nullSafe()

    private val listOfTAdapter: JsonAdapter<List<T>> =
            moshi.adapter<List<T>>(Types.newParameterizedType(List::class.java, types[0])).nonNull()

    override fun toString(): String = "GeneratedJsonAdapter(Foo)"

    override fun fromJson(reader: JsonReader): Foo<T> {
        var bar: String? = null
        var defaultValue: Int? = null
        var nullableString: String? = null
        var typeParam: T? = null
        var typeParamSet: Boolean = false
        var tList: List<T>? = null
        reader.beginObject()
        while (reader.hasNext()) {
            when (reader.selectName(options)) {
                0 -> bar = stringAdapter.fromJson(reader) ?: throw JsonDataException("Non-null value 'bar' was null at ${reader.path}")
                1 -> defaultValue = intAdapter.fromJson(reader) ?: throw JsonDataException("Non-null value 'defaultValue' was null at ${reader.path}")
                2 -> nullableString = nullableStringAdapter.fromJson(reader)
                3 ->  {
                    typeParam = nullableTAdapter.fromJson(reader)
                    typeParamSet = true
                }
                4 -> tList = listOfTAdapter.fromJson(reader) ?: throw JsonDataException("Non-null value 'tList' was null at ${reader.path}")
                -1 -> {
                    // Unknown name, skip it.
                    reader.skipName()
                    reader.skipValue()
                }
            }
        }
        reader.endObject()
        var result = Foo<T>(
                bar = bar ?: throw JsonDataException("Required property 'bar' missing at ${reader.path}"),
                nullableString = nullableString,
                tList = tList ?: throw JsonDataException("Required property 'tList' missing at ${reader.path}"))
        result = result.copy(
                defaultValue = defaultValue ?: result.defaultValue,
                typeParam = if (typeParamSet) typeParam else result.typeParam)
        return result
    }

    override fun toJson(writer: JsonWriter, value: Foo<T>?) {
        if (value == null) {
            throw NullPointerException("value was null! Wrap in .nullSafe() to write nullable values.")
        }
        writer.beginObject()
        writer.name("barString")
        stringAdapter.toJson(writer, value.bar)
        writer.name("defaultValue")
        intAdapter.toJson(writer, value.defaultValue)
        writer.name("nullableString")
        nullableStringAdapter.toJson(writer, value.nullableString)
        writer.name("typeParam")
        nullableTAdapter.toJson(writer, value.typeParam)
        writer.name("tList")
        listOfTAdapter.toJson(writer, value.tList)
        writer.endObject()
    }
}